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problem with System()

Scheduled Pinned Locked Moved Unsolved General and Desktop
system commandsystem
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  • AlvaroSA AlvaroS

    @mrjj It works in the same way... :(

    jsulmJ Offline
    jsulmJ Offline
    jsulm
    Lifetime Qt Champion
    wrote on last edited by
    #18

    @AlvaroS So, if you enter /home/user1/princi in a terminal window and press enter it does not start? What happens? Any error message?

    https://forum.qt.io/topic/113070/qt-code-of-conduct

    AlvaroSA 1 Reply Last reply
    1
    • AlvaroSA AlvaroS

      @mrjj It works in the same way... :(

      mrjjM Offline
      mrjjM Offline
      mrjj
      Lifetime Qt Champion
      wrote on last edited by
      #19

      @AlvaroS

      Ok, you must debug then
      try to use
      http://doc.qt.io/qt-5/qprocess.html#error
      to see what it thinks.

      AlvaroSA 1 Reply Last reply
      2
      • jsulmJ jsulm

        @AlvaroS So, if you enter /home/user1/princi in a terminal window and press enter it does not start? What happens? Any error message?

        AlvaroSA Offline
        AlvaroSA Offline
        AlvaroS
        wrote on last edited by
        #20

        @jsulm In a terminal if I write

        ./princi 0 747.37 427.68 0 844.37 42.54 prueba_princi.bmp 0 0 +
        

        in /home/user1/ directory it runs good

        jsulmJ AlvaroSA 2 Replies Last reply
        0
        • AlvaroSA AlvaroS

          @jsulm In a terminal if I write

          ./princi 0 747.37 427.68 0 844.37 42.54 prueba_princi.bmp 0 0 +
          

          in /home/user1/ directory it runs good

          jsulmJ Offline
          jsulmJ Offline
          jsulm
          Lifetime Qt Champion
          wrote on last edited by jsulm
          #21

          @AlvaroS Then try what @mrjj suggested

          https://forum.qt.io/topic/113070/qt-code-of-conduct

          1 Reply Last reply
          0
          • mrjjM mrjj

            @AlvaroS

            Ok, you must debug then
            try to use
            http://doc.qt.io/qt-5/qprocess.html#error
            to see what it thinks.

            AlvaroSA Offline
            AlvaroSA Offline
            AlvaroS
            wrote on last edited by
            #22
            This post is deleted!
            mrjjM 1 Reply Last reply
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            • AlvaroSA AlvaroS

              @jsulm In a terminal if I write

              ./princi 0 747.37 427.68 0 844.37 42.54 prueba_princi.bmp 0 0 +
              

              in /home/user1/ directory it runs good

              AlvaroSA Offline
              AlvaroSA Offline
              AlvaroS
              wrote on last edited by AlvaroS
              #23

              @AlvaroS said:

              @jsulm In a terminal if I write

              ./princi 0 747.37 427.68 0 844.37 42.54 prueba_princi.bmp 0 0 +
              

              in /home/user1/ directory it runs good

              @jsulm said:

              @AlvaroS Then try what @mrjj suggested

              okey, it gives me UnknowError.... http://doc.qt.io/qt-5/qprocess.html#ProcessError-enum

              1 Reply Last reply
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              • AlvaroSA AlvaroS

                This post is deleted!

                mrjjM Offline
                mrjjM Offline
                mrjj
                Lifetime Qt Champion
                wrote on last edited by
                #24

                @AlvaroS

                well you can use
                qDebug() "qproc: " << myProcess->error();

                and check the code in
                http://doc.qt.io/qt-5/qprocess.html#ProcessError-enum

                AlvaroSA 1 Reply Last reply
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                • mrjjM mrjj

                  @AlvaroS

                  well you can use
                  qDebug() "qproc: " << myProcess->error();

                  and check the code in
                  http://doc.qt.io/qt-5/qprocess.html#ProcessError-enum

                  AlvaroSA Offline
                  AlvaroSA Offline
                  AlvaroS
                  wrote on last edited by
                  #25

                  @mrjj Yes thanks!! See my last post. Thanks again. It gives me Unknow error...

                  mrjjM 1 Reply Last reply
                  0
                  • AlvaroSA AlvaroS

                    @mrjj Yes thanks!! See my last post. Thanks again. It gives me Unknow error...

                    mrjjM Offline
                    mrjjM Offline
                    mrjj
                    Lifetime Qt Champion
                    wrote on last edited by
                    #26

                    @AlvaroS

                    " This is the default return value of error()."

                    You do call it AFTER u call
                    myProcess->start(program,arguments); ?

                    AlvaroSA 1 Reply Last reply
                    1
                    • mrjjM mrjj

                      @AlvaroS

                      " This is the default return value of error()."

                      You do call it AFTER u call
                      myProcess->start(program,arguments); ?

                      AlvaroSA Offline
                      AlvaroSA Offline
                      AlvaroS
                      wrote on last edited by
                      #27

                      @mrjj Yes:

                          myProcess->start(program, arguments);
                      
                          QProcess::ProcessError error = myProcess->error();
                      
                      mrjjM 1 Reply Last reply
                      0
                      • AlvaroSA AlvaroS

                        @mrjj Yes:

                            myProcess->start(program, arguments);
                        
                            QProcess::ProcessError error = myProcess->error();
                        
                        mrjjM Offline
                        mrjjM Offline
                        mrjj
                        Lifetime Qt Champion
                        wrote on last edited by
                        #28

                        @AlvaroS
                        hmm really odd then
                        it should say FailedToStart

                        Just to be 100% clear.

                        princi is never run ?

                        AlvaroSA 1 Reply Last reply
                        1
                        • mrjjM mrjj

                          @AlvaroS
                          hmm really odd then
                          it should say FailedToStart

                          Just to be 100% clear.

                          princi is never run ?

                          AlvaroSA Offline
                          AlvaroSA Offline
                          AlvaroS
                          wrote on last edited by
                          #29

                          @mrjj said:

                          @AlvaroS
                          hmm really odd then
                          it should say FailedToStart

                          Just to be 100% clear.

                          princi is never run ?

                          okey look.
                          if I write:

                              myProcess->start(program, arguments);
                          
                              myProcess->waitForFinished(3000);
                          
                              QProcess::ProcessError error = myProcess->error();
                          
                          

                          Now error says:
                          QProcess::Crashed The process crashed some time after starting successfully.

                          1 Reply Last reply
                          0
                          • mrjjM Offline
                            mrjjM Offline
                            mrjj
                            Lifetime Qt Champion
                            wrote on last edited by mrjj
                            #30

                            so it sounds like your princi do run but it crashes?

                            oh. sorry my bad. start is async so calling error right after was
                            not correct.

                            waitForFinished fixed that.

                            AlvaroSA 1 Reply Last reply
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                            • mrjjM mrjj

                              so it sounds like your princi do run but it crashes?

                              oh. sorry my bad. start is async so calling error right after was
                              not correct.

                              waitForFinished fixed that.

                              AlvaroSA Offline
                              AlvaroSA Offline
                              AlvaroS
                              wrote on last edited by
                              #31

                              @mrjj Yes... I think so...
                              How should I pass the arguments?

                              the arguments of princi are:

                              0 wps.front().x() wps.front().y() 0 wps.back().x() wps.front().y() prueba_princi.bmp 0 0 +
                              

                              so my QStringList arguments is:

                               QStringList arguments;
                              arguments << "0" << QString::number(wps.front().x()) << QString::number(wps.front().y()) << "0" << QString::number(wps.back().x()) << QString::number(wps.back().y()) << "prueba_princi.bmp" << "0" << "0" << "+" ;
                              
                              
                              1 Reply Last reply
                              0
                              • mrjjM Offline
                                mrjjM Offline
                                mrjj
                                Lifetime Qt Champion
                                wrote on last edited by
                                #32

                                it seems fine
                                You should look inside princi for how it
                                reads it. it must be that part that is crashing ?

                                AlvaroSA 2 Replies Last reply
                                0
                                • mrjjM mrjj

                                  it seems fine
                                  You should look inside princi for how it
                                  reads it. it must be that part that is crashing ?

                                  AlvaroSA Offline
                                  AlvaroSA Offline
                                  AlvaroS
                                  wrote on last edited by
                                  #33

                                  @mrjj yes, but it really rare that if I run from terminal princi runs good...

                                  1 Reply Last reply
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                                  • mrjjM mrjj

                                    it seems fine
                                    You should look inside princi for how it
                                    reads it. it must be that part that is crashing ?

                                    AlvaroSA Offline
                                    AlvaroSA Offline
                                    AlvaroS
                                    wrote on last edited by AlvaroS
                                    #34

                                    @mrjj And if I write:

                                    system ("./princi 0 5 10 0 7 8 prueba_princi.bmp 0 0 +")
                                    where 5,10,7 and 8 are wps.front,wps.back....
                                    it runs well...

                                    mrjjM 1 Reply Last reply
                                    0
                                    • SGaistS Offline
                                      SGaistS Offline
                                      SGaist
                                      Lifetime Qt Champion
                                      wrote on last edited by
                                      #35

                                      What is that + sign doing as parameter ?

                                      Interested in AI ? www.idiap.ch
                                      Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

                                      AlvaroSA 1 Reply Last reply
                                      1
                                      • SGaistS SGaist

                                        What is that + sign doing as parameter ?

                                        AlvaroSA Offline
                                        AlvaroSA Offline
                                        AlvaroS
                                        wrote on last edited by
                                        #36

                                        @SGaist + is just and argument that i have to pass to princi

                                        1 Reply Last reply
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                                        • AlvaroSA AlvaroS

                                          @mrjj And if I write:

                                          system ("./princi 0 5 10 0 7 8 prueba_princi.bmp 0 0 +")
                                          where 5,10,7 and 8 are wps.front,wps.back....
                                          it runs well...

                                          mrjjM Offline
                                          mrjjM Offline
                                          mrjj
                                          Lifetime Qt Champion
                                          wrote on last edited by
                                          #37

                                          @AlvaroS
                                          well you must debug it then.
                                          Try to qDebug inside princi what you read and compare that to what u read for
                                          system ("./princi 0 5 10 0 7 8 prueba_princi.bmp 0 0 +")

                                          Sadly We cannot guess why you crash from the code shown.

                                          Also you dump the arguments to qDebug before u
                                          call start, just to see what u are sending also.

                                          and then take it from there.

                                          1 Reply Last reply
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